Revenues in Consolidated Statements of Operations from Arrangements for which Vendor-Specific Objective Evidence of Fair Value Does Not Exist for Each Undelivered Element (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenue Recognition, Milestone Method [Line Items]
Software license fees	$ 41,356	$ 50,910
Maintenance fees	58,634	43,735
Services	23,929	22,852
Total revenues	161,997	137,625
Vendor Specific Objective Evidence of Fair Value
Revenue Recognition, Milestone Method [Line Items]
Software license fees	5,801	11,659
Maintenance fees	2,321	3,996
Services	3	435
Total revenues	$ 8,125	$ 16,090